package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetMealService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Select;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
@Slf4j
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetMealService setMealService;

    /**
     * 删除分类，前提是分类下没有关联菜品或者套餐
     *
     * @param id
     */
    @Override
    public void remove(Long id) {
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        //统计对应分类下关联了多少菜品
        int count1 = dishService.count(dishLambdaQueryWrapper);
        //查询当前分类是否已经关联了菜品，如果已经关联就抛出一个业务异常
        if (count1 > 0) {
            //已经关联菜品，抛出一个异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查询当前分类是否已经关联了套餐，如果关联了套餐就抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        //查询统计对应分类下关联了多少套餐
        int count2 = setMealService.count(setmealLambdaQueryWrapper);
        //查询当前分类是否已经关联了套餐，如果已经关联就抛出一个业务异常
        if (count2 > 0) {
            //已经关联套餐，抛出一个异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }

        //正常删除
        super.removeById(id);


    }
}
